Scaler Back Single Blade Vintage Imperial Toothpick Fish Knife

Found this in my grandfather's stuff seemed interesting. did a quick search and couldn't find anything. help identifying? : r/knives

Over 4in. Fish Scaler Vintage Folding Knives 2 Blades for sale

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Imperial Fish Knife

OLD USA VINTAGE COLONIAL FISH KNIFE SCALER TEXAS TOOTHPICK TICKLER 1 ONE BLADE

Vintage Imperial PROV USA 1-Blade Texas Toothpick w/Foil Scales Flying Mallard c.1946-56